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Question
· Jul 13, 2021

Method return List of type

#ObjectScript #Caché

Good afternoon I am making a method of a class that I want to return a list of objects of another class that I have defined, example:

ClassMethod myMethod() As list of MyPackage.MyClass
{
}

But it gives me a syntax error, I try this and it works:

ClassMethod myMethod() As %ListOfObjects
{
}

But I would like to keep the typing.

Is there a way?

Product version: Caché 2018.1
Discussion (5)2
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David Hockenbroch · Jul 13, 2021

ObjectScript variables are untyped, so preserving the type isn't necessary.

You'll build the list by adding your MyPackage.MyClass objects to it, then you'll return the %ListOfObjects, then you'll use that list's methods to manipulate those objects. For instance, set mything = mylist.GetAt(1) will give you an object that is identical to the MyPackage.MyClass object you put in the list with all of its properties an methods.

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Timothy Leavitt · Jul 19, 2021

The right way to describe a list of a particular type of object is:

ClassMethod myMethod() As %ListOfObjects(ELEMENTTYPE="MyPackage.MyClass")

This is most relevant from the perspective of XML projections - e.g., web services. You can also define a subclass of %ListOfObjects with the ELEMENTTYPE parameter overridden for reuse. See https://docs.intersystems.com/irislatest/csp/docbook/Doc.View.cls?KEY=GX...

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